Roentgenological seminar.
D001466:Barium Sulfate; D003937:Diagnosis, Differential; D004931:Esophageal Achalasia / Q000000981:diagnostic imaging*; D004940:Esophageal Stenosis / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008875:Middle Aged; D013902:Radiography, Thoracic
D001466:Barium Sulfate